misc.c

自己精简过的PPPD代码。在嵌入中应用可以更好的发挥。比原先的小了很多

///////////////from options.c

#include <ctype.h>
#include <stdio.h>
#include <errno.h>
#include <unistd.h>
#include <fcntl.h>
#include <stdlib.h>
#include <syslog.h>
#include <string.h>
#include <pwd.h>
#ifdef PLUGIN
#include <dlfcn.h>
#endif

#ifdef PPP_FILTER
#include <pcap.h>
/*
 * There have been 3 or 4 different names for this in libpcap CVS, but
 * this seems to be what they have settled on...
 * For older versions of libpcap, use DLT_PPP - but that means
 * we lose the inbound and outbound qualifiers.
 */
#ifndef DLT_PPP_PPPD
#ifdef DLT_PPP_WITHDIRECTION
#define DLT_PPP_PPPD	DLT_PPP_WITHDIRECTION
#else
#define DLT_PPP_PPPD	DLT_PPP
#endif
#endif
#endif /* PPP_FILTER */

#include "pppd.h"
#include "pathnames.h"

#if defined(ultrix) || defined(NeXT)
char *strdup __P((char *));
#endif


/*
 * Option variables and default values.
 */
int	debug = 0;		/* Debug flag */
int	kdebugflag = 0;		/* Tell kernel to print debug messages */
int	default_device = 1;	/* Using /dev/tty or equivalent */
char	devnam[MAXPATHLEN];	/* Device name */
bool	nodetach = 0;		/* Don't detach from controlling tty */
bool	updetach = 0;		/* Detach once link is up */
int	maxconnect = 0;		/* Maximum connect time */
char	user[MAXNAMELEN];	/* Username for PAP */
char	passwd[MAXSECRETLEN];	/* Password for PAP */
bool	persist = 0;		/* Reopen link after it goes down */
char	our_name[MAXNAMELEN];	/* Our name for authentication purposes */
bool	demand = 0;		/* do dial-on-demand */
char	*ipparam = NULL;	/* Extra parameter for ip up/down scripts */
int	idle_time_limit = 0;	/* Disconnect if idle for this many seconds */
int	holdoff = 30;		/* # seconds to pause before reconnecting */
bool	holdoff_specified;	/* true if a holdoff value has been given */
int	log_to_fd = 1;		/* send log messages to this fd too */
bool	log_default = 1;	/* log_to_fd is default (stdout) */
int	maxfail = 10;		/* max # of unsuccessful connection attempts */
char	linkname[MAXPATHLEN];	/* logical name for link */
bool	tune_kernel;		/* may alter kernel settings */
int	connect_delay = 1000;	/* wait this many ms after connect script */
int	req_unit = -1;		/* requested interface unit */
bool	multilink = 0;		/* Enable multilink operation */
char	*bundle_name = NULL;	/* bundle name for multilink */
bool	dump_options;		/* print out option values */
bool	dryrun;			/* print out option values and exit */
char	*domain;		/* domain name set by domain option */
int	child_wait = 5;		/* # seconds to wait for children at exit */

#ifdef MAXOCTETS
unsigned int  maxoctets = 0;    /* default - no limit */
int maxoctets_dir = 0;       /* default - sum of traffic */
int maxoctets_timeout = 1;   /* default 1 second */ 
#endif


extern option_t auth_options[];
extern struct stat devstat;

#ifdef PPP_FILTER
struct	bpf_program pass_filter;/* Filter program for packets to pass */
struct	bpf_program active_filter; /* Filter program for link-active pkts */
#endif

char *current_option;		/* the name of the option being parsed */
int  privileged_option;		/* set iff the current option came from root */
char *option_source;		/* string saying where the option came from */
int  option_priority = OPRIO_CFGFILE; /* priority of the current options */
bool devnam_fixed;		/* can no longer change device name */

static int logfile_fd = -1;	/* fd opened for log file */
static char logfile_name[MAXPATHLEN];	/* name of log file */


/*
 * option_error - print a message about an error in an option.
 * The message is logged, and also sent to
 * stderr if phase == PHASE_INITIALIZE.
 */
void
option_error __V((char *fmt, ...))
{
    va_list args;
    char buf[1024];

#if defined(__STDC__)
    va_start(args, fmt);
#else
    char *fmt;
    va_start(args);
    fmt = va_arg(args, char *);
#endif
    vslprintf(buf, sizeof(buf), fmt, args);
    va_end(args);
    if (phase == PHASE_INITIALIZE)
	fprintf(stderr, "%s: %s\n", progname, buf);
    syslog(LOG_ERR, "%s", buf);
}